How are changed and updated different

Simple question - I’m trying to understand the difference(s) between “changed” and “updated”. Seems like they are the same, struggling to understand which is best to choose and what difference it would make.

I can not change something w/o updating it and if I update something it will be changed - or is the difference I can update with the same data - like update 7 to 7? Then it would not be changed - I’m somewhat befuddled